Sorry to hear that the NBN isn't working,
I would suggest doing some troubleshooting to see if the issue can be resolved from your end
Remove the power cable from the back of your modem for 60 seconds, then plug it back in. After approximately 2 minutes the lights on the modem should settle into a stable pattern.
If restarting your modem didn’t work, please follow the full instructions in This Article
I can appreciate that you're wanting to get online ASAP and we do have some support measures in place for the interim, you can find these on our Coronavirus Support page.
Please note, our Messaging team are currently experiencing delays
Ask to speak to a human, then leave your full name and the information about the issue in the messenger window
Stay safe, and I hope we can get your connection up and running soon